Julia Roberts' late half-sister left a suicide note citing her tortured relationship with the Oscar winner, a source close to the investigation told the Daily News Tuesday.

"It was definitely a suicide. She left a five-page suicide letter. The EMT found it," the source told The News.

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"There were three pages of rantings that her sister drove her to do this. There was one page to her mom, telling her how much she loved her, and one page apologizing to (her fiancé John Dilbeck)," the source said.

Dilbeck found the body of Nancy Motes, 37, about 2 p.m. Sunday in a bathtub filled with water at a Los Angeles home, the source said.

Motes had been pet-sitting for a client who rented the home. She may have been dead for about 12 hours before her body was found, the source said.

Nancy Motes had a falling out with Julia Roberts after giving a tell-all interview last summer, sources said. (Jordan Strauss/Invision/AP)

"It looks like a pill overdose," the source said.

Motes, a Georgia native, was the daughter of Roberts' mother, Betty Lou, and stepfather, Michael Motes.

She had a falling out with Roberts, 46, after giving a tell-all interview last summer and accusing the "Pretty Woman" actress of blocking her access to their sick mother, the source said.

In the days leading up to Motes' death, she sounded emotionally unstable in posts on her Twitter account.

Nancy Motes holds up a photo of herself with Julia Roberts. (Glen McCurtayne/Coleman-Rayner)

"So my 'sister' said that with all her friends & fans she doesn't need any more love. Just so you all know 'America's Sweetheart' is a B----!!'" she tweeted on Jan. 20, referring to Roberts' star turn in the 2001 rom-com "America's Sweethearts."

"Do you want to be a fan of someone so cruel? She's not even that good of an actress. Happy you totally F---ed with me?" she added in a subsequent missive.

"(M)y own family has abandoned me," Motes tweeted Jan. 22.

The News confirmed the @Dabbs76 Twitter handle belonged to Motes before her death. The angry tweets were still visible late Monday but had disappeared by early Tuesday.

'Having such a blast at horror nights! Love Halloween!!!!!!' Nancy Motes captioned a Twitter photo with her fiance from October 2013. (@Danns76 via Twitter)

Motes long struggled with being overweight and living in her movie star sister's shadow.

In August, Motes gave an interview claiming Roberts criticized her appearance as a teen.

"When I was in high school and she was an adult, she would just let me know that I was definitely overweight," Motes said at the time.

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"It just makes me feel incredibly hurt and very sad," added Motes, who once weighed nearly 300 pounds before her decision to undergo gastric bypass surgery in June 2010.

Nancy Motes was planning to marry finace John Dilbeck this year. (Twitter)

She said she hoped her transformation would help repair their fractured relationship, but she noted it was still "a work in progress."

"It's not going to be fixed overnight, nor do I think it's going to be fixed at this point by me just getting skinny," she said.

Craig Harvey, chief of coroner investigations for Los Angeles County, told The News that Motes "was found in a bathtub that contained water. There were prescription and nonprescription drugs found at the scene. The role the drugs may or may not have played is not yet known."

An autopsy was completed as of Tuesday morning, but the cause of death was deferred pending additional toxicology tests, coroner spokesman Ed Winter said.

Julia Roberts, pictured last month at the Screen Actors Guild Awards, canceled her public appearances Monday following news of her half-sister’s death. (Kevin Mazur/WireImage)

Winter confirmed the suicide note but said he didn't believe it was five pages.

Roberts canceled her public appearances Monday, including a spot on "Jimmy Kimmel Live."

Her rep confirmed a statement on the tragedy obtained by People.com.

"It is with deep sadness that the family of Nancy Motes ... confirms that she was found dead in Los Angeles yesterday of an apparent drug overdose," the statement said. "The family is both shocked and devastated."